Disease prevalence is the proportion of a population that is infected at a specified time. In a susceptible-infective model with total population , it is .
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Prevalence is a statistical measure used in epidemiology and public health to indicate the proportion of a population that has a specific characteristic, condition, or disease at a given point in time or over a specified period. It is typically expressed as a percentage or per a certain number of individuals (e.g., per 1,000 or 100,000 people).